Electricity: battery or capacitor charging or discharging – Battery or cell charging – Pulsed
Reexamination Certificate
2001-09-21
2004-05-25
Tibbits, Pia (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell charging
Pulsed
Reexamination Certificate
active
06741066
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to power management for battery powered devices, and more particularly, to a power management topology that includes an external AC/DC adapter that is controlled by battery charge controller associated with a portable device.
2. Background Description
Present battery charging topologies are divided into two separate designs and implementation: AC adapters and battery charging topologies.
AC adapters have two present designs:
1) 60 Hz—Low cost transformers with full wave rectifiers and a filter capacitor. The windings of the transformer usually have high resistance that results in a quasi constant current source.
2) Hi Frequency—Promoted as the travel version of AC adapterslwith high frequency usually >100 KHz. As reactive impedance is a direct function of frequency (Xl=2&pgr;fL and Xc=½&pgr;fC) for the same impedance L and C are smaller by the ratio of frequencies. For example the size of an inductor for 600,000 Hz vs 60 Hz is the ratio of 60/600,000 or 1/10,000=0.000 1. These travel versions of AC adapters are designed with high frequency Switch Mode Power Supplies (SMPS). Hence the benefits are small size and light weight, highly valued by travelers, but may cost more than other types of adapters.
Most adapters in use today include PWM circuitry and controllers (including power switches and DC/DC converter circuitry such as Buck, flyback, boost, bridge, or other type of converter topology) to generate a regulated output.
Battery Chargers in systems like notebook computers, cellular phones and PDA's are generally used to control battery charging and/or power distribution to a system. Battery chargers generally have three popular designs:
1) Simple switched adapter charger uses a single electronic switch to directly connect the adapter to the battery. Then turning the switch off when the final charge voltage is reached. While relatively inexpensive, this type of charger circuitry must use a constant current AC Adapter generally the heavy, 60 Hz type. The battery charging algorithm is highly compromised, resulting in long charge times, perhaps never reaching full charge and limited ability to adapt to multiple battery chemistries like LiIon, NiMH and NiCd.
2) Linear regulators—Creation of a fixed output voltage is developed by dissipating excess input voltage within the regulating component. This usually results in efficiencies of 50% or less. The wasted power is dissipated within the regulator increasing the temperature within the small, tightly enclosed product. Additionally the wasted power significantly shortens the battery life which is of paramount importance to anyone carrying these products around. The only benefit for a consumer product with a dead battery is as an expensiveipiece of exercise equipment. The benefits of linear regulators are simplicity and low cost. The negatives include short battery life and high internal temperatures.
3) Switchmode Regulators—As described above, this method uses a switched mode power supply to efficiently (90 to 95%) convert the input voltage to the battery charge voltage. Optimum charging algorithms can be applied like constant current mode switching to constant voltage mode. Benefits of this type of design are rapid charging, high efficiency and adaptability to varying adapters and battery chemistries, but may cost more than linear regulators.
FIG. 1
depicts a conventional power management topology for a portable device. The system includes a portable device
10
that includes one or more batteries
30
and one or more active systems
18
,
20
, and/or
22
coupled to an AC/DC adapter
12
. The adapter
12
operates to deliver controlled power to both charge the batteries and power any systems coupled thereto. A battery charger circuit
14
is provided to provide regulated power (voltage and/or current) to the battery
30
based on, for example, battery charging current, battery voltage, and/or available power from the adapter
12
. Referring to
FIG. 1A
, a block diagram of a conventional battery charger circuit
14
is depicted. As is well understood in the art, the charger generally includes a plurality of error amplifiers
34
that monitor-battery voltage and/or current and generate an error signal if the battery voltage and/or current exceed some predetermined threshold. Additionally, an error amplifier may be included to monitor input power availability and generate an error signal if the available power from the adapter
12
is exceeded. The charger
14
also includes a PWM generator and controller
36
. The error signals generated by the error amplifiers are received by the controller
36
and operate to adjust the duty cycle of the PWM generator. The PWM signal is supplied to power switches and DC/DC converter
38
to generate a regulated DC source for charging the batteries.
Similarly, the AC/DC adapter
12
includes a PWM generator and controller, and firther includes power switches and a DC/DC converter to provide a regulated output power source. Thus, a redundancy exists since both the adapter
12
and the charger
14
include a PWM generator and controller, power switches and a DC/DC converter.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides a power management topology that includes an external AC/DC adapter that is controlled by battery charge controller. In the exemplary embodiments, the charge controller includes the error amplifiers to generate a feedback control signal, while the AC/DC adapter is modified to receive the control feedback signal to regulate the duty cycle of the PWM generator associated with the adapter. Thus, in the exemplary embodiments, the need for a PWM generator and controller, as well as power switches and a DC/DC converter are eliminated in the charger circuit, thereby economizing power topologies, as well as removing heat-generating portions of a conventional battery charger circuit to the external AC/DC adapter.
System exemplary embodiments include a power management topology for a portable electronic device, comprising a portable electronic device comprising a rechargeable battery and a charge controller comprising circuitry generating a feedback signal indicative of battery voltage and/or battery charging current. The topology also includes an external AC/DC adapter generating a DC source signal from an AC source, said adapter comprising a PWM generator generating a PWM signal and controller. The controller receives the feedback signal and adjusts the duty cycle of the PWM signal thereby adjusting the voltage and/or current value of the DC source signal.
In other exemplary embodiments, the present invention provides an AC/DC adapter comprising a PWM generator generating a PWM signal, a controller receiving a feedback signal generated by an external portable electronic device, and a DC/DC converter circuit generating a DC source signal. The controller adjusts the duty cycle of the PWM signal based on the feedback signal thereby adjusting the voltage and/or current value of the DC source signal.
It will be appreciated by those skilled in the art that although the following Detailed Description will proceed with reference being made to preferred embodiments and methods of use, the present invention is not intended to be limited to these preferred embodiments and methods of use. Rather, the present invention is of broad scope and is intended to be limited as only set forth in the accompanying claims.
REFERENCES:
patent: 5355073 (1994-10-01), Nguyen
patent: 5764030 (1998-06-01), Gaza
patent: 5998966 (1999-12-01), Gaza
patent: 6002237 (1999-12-01), Gaza
patent: 6029074 (2000-02-01), Irvin
patent: 6118254 (2000-09-01), Faulk
Densham William L.
Popescu-Stanesti Vlad Mihail
Spiridon Constantin
Grossman Tucker Perreault & Pfleger PLLC
O2Micro International Limited
Tibbits Pia
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